It would be extra work to dry out the dessicant, which is constantly exposed to the atmosphere. Still, if you could get the color-changing crystals in a glass tube, and have only a small air hole, it would be excellent for removing water. However it would not prevent the methanol from evaporating out [see below]. I top off my working jug with a second jug. I found a flexible spout at the Walmart auto section for $ .50. Otherwise, pouring fuel out of a jug requires a big funnel and then you can't see very well. I have also upgraded my two working jugs with Slimline caps [expensive !] because the DuBro and Great Planes do not seal completely. I think for a low cost solution, epoxy two short brass tubes thru a jug cap. Put a short piece of fuel tubing on the outside of the vent tube. When not in use put your fuel filler fitting into the vent line tube. Then you have a completely sealed system. I had never though about the methanol evaporating out [thanks, Sports Pilot !], just water coming in but sealing the system prevents both.Unfortunately Slimline is undergoing some problems. Ron's Heli South has inventory of parts and pumps.